PM72236: The exception, ConcurrentModificationException, occurs during session failover.

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APAR status

• Closed as program error.

Error description

• The exception, ConcurrentModificationException, occurs during
  HTTP session replication.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of WebSphere eXtreme Scale        *
  *                  for HTTP session replication.               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Web applications call                   *
  *                      HttpSession.getAttributeNames() and     *
  *                      iterate through the resulting           *
  *                      Enumeration.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When using eXtreme Scale for HTTP session replication, if a
  web application calls the HttpSession.getAttributeNames() API,
  then iterates through the resulting Enumeration after an
  application server failover, a ConcurrentModificationException
  occurs.
  

Problem conclusion

• The eXtreme Scale client code has been fixed to avoid
  ConcurrentModificationException exceptions after a
  getAttributeNames call is initiated.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R850 PSY

     UP